Ash remover



E. C. LUNDA ASH REMOYER March 29, 1938.

Filed June 18, 1935 2 Sheets-Sheet l E. C. LUNDA ASH REMOVER March 29, 1938.

Filed June 18, 1955 2 Sheets-Sheet 2 Patented Mar. 29, 1938 2,112,420 ASH BEMOVER Edward 0. Lunda, Portland, Oreg.,

Manufacturing Company,

.Iron Fireman land. Oreg.

-- Application June 18, 1935, Serial No.

assignmto Port- 4 Claimfl. (01. 110-45) This invention relates generally to underfeed stokers, and particularly to ash removers therefor.

The main object of this invention is the provision of an exceedingly simple and efficient form of underfeed stoker employing the unique form of ash remover which is adaptable to manual or power driven operation.

The second object is proved form of ash remover employing a pin hole grate surface through which air may be supplied 'to the fuel over a relatively large area and to which is added a means for scraping the grate surface and depositing the main body of the ashes in outlets which discharge beyond theplenum chamber.

The third object is the provision of astoker having pin hole grates together with means for withdrawing ashes from the floor of'the plenum chamber.

I'accomplish these and other objects inthe manner set forth in the following specification as illustrated in the accompanying drawings, in

which Fig. 1 is a perspective view of the device showing the'stoker partially broken away.

Fig. 2-15 a section taken along the line 2-2 in Fig. 1.

Fig. 3 is a horizontal section taken along the line 3-3 in Fig.2. V

Fig. 4.is a section taken along the line 4-4 in Fig. 2.

Fig. 5 is a section in Fi 4.

Fig. 6 is a section tlhoush-thgfurnace showing the retort and tuyeres together with the ash remover mechanism in elevation.

Fig. 7 is a section taken along the in Fig. 5.

Similar numbers of parts throughout the several views.

Referring in detail to the drawings, there is shown the usual form of hopper I0, whose base communicates by means of a coal feeding tube l2 with a retort section ll which is surrounded by means of a circular wall |4 forming a plenum chamber l5.

Within the coal tube |2 is a worm i6 which'is driven by a motor I] through a gearing con tained within the operates a fan contained within the fan. casing taken along the line 5-5 line 1;

I! which communicatesby means of an air delivery duct 20 with the plenum chamber Ii.

The plenum pass from ing through the floor 2| the provision of an im.

' of the top of the retort" parted to the ash reference refer to similar casing IS. The motor II also connecting rod 42 whi chamber walls l4 rest upon a floor j upon the legs 22. The floor 2| is provided with a plurality of slots 23 through which ashes. can the plenum chamber i5 downwardly through the floor 2| into the ash pit 24. Extendis a vertical shaft 25 on whose squared upper end 28 is riveted awheel 21 provided with slots 24 which can be brought into register with the slots 23 when the shaft 25 is rocked. On the is secured the hub 29 of a rock lever 30 provided with the upturned ends II. To the lever 20 is attached a connecting rod 32 which may be reciprocated by means of a hand lever 23 which isfiulcrumed on the standard 24', or it may be operated by power in any convenient manner.

The plenum chamber I5 is provided with a top 35 upon which rests the outside tuyere rin 34 which is provided with an annular rib 31, w ch in turn extends into a groove 28 in the top 35. The outside tuyere ring 3,8 ed to the top I! by means of the bolts 391"Within the outside tuyere ring 36 are placed three tuyeie segments 40, whose innermost walls 4i form an extension and whose tops 42 arehorizontal and provided with pin hole openings 43." .The walls 4| 'are provided-with air outlet openings 44 through which air flows to the incoming coal the members 38 and 40 are secured to the outer means of the bolts 4.

Surrounding the outer tuyere ring 30 is the ash removing ring 4] from whichinwardly pm iect the radial arms 44 which extend almost to the inner walls 4| and rest upon the upper surfaces of the tops 42. A rocking motion is imremoving ring 41 by the ends 3|, which are attached thereto in any convenlent manner. Surrounding the ash removing ring 41 and spaced therefrom for clearance purposes is the wall 49 of the ash pit 24.

4a. The tuyere segments tuyere ring 24; by

PATENT OFFICE from the space between The plenum. chamber communicates with the space 45 through the openings I. Channels II are formed through the ring 24 and slotsil-A are formed in the top portions 42 through which ashes may escape from the upper side of the top 42 into. the ash pit 24 withoutpassll'ig through the openings 43. The slots iI-A. are normally covered by the radial arms 44 when the hand lever 33 is in one extreme position of travel, as determined by the stop pins 52 in the throush the furnacefront --52,' which forms a s'top for the pins "52 in either direction.

The operation of the device is asfollowsz' section, a tuyre Coal is being fed from the tube l2 into the retort I 3 from whence it passes upwardly past the openings 44 and outwardly upon the perforated top grate portions 42 where it is burned by the air delivered from the plenum chamber l5 from whence it escapes through the openings 43. As this coal is burned to an'ash over the relatively large surface presented, it is possible to perform this burning at a lower temperature than would be possible if a smaller burning area were employed and the which event the incombustibles would be fused and the problem of removing the clinkers formed would increase in diflicultv.

which break up as' soon as they are disturbed. The removal of the ash is accomplished by rocking the lever 33 which causes the arms 48 to move around the perforated grate surface 42 and carry the loose ash to the slots 5| which are uncovered by such movement of the arms 48.

While the majority of the ashes will be removed through the slots 5| into the ash pit 24, a small proportion thereof will fall through the pin holes 43 and pass through the openings 50 onto the floor plate 2| from whence they are discharged into the ash pit 24 by the rocking of the wheel 21, which occurs the movement of the arms 48.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. In an underfeed stoker, the combination of a retort section, an ash pit under said retort section, said tuyre section surrounding the opening in said retort section, said tuyere section having a substantially flat perforated top, means for supplying air to the perforations in said top, an ash removing ring capable of partial rotation about said tuyere section, and means for effecting said partial rotation, said ring having a plurality of radial arms extending toward the center thereof and disposed above said perforated top, said tuyere section having ash ducts communieating with its upper side and said ash pit,'sai,d arms normally covering said ash ducts to prevent the passage of unburned fuel and gas therethrough while the stoker is being operated. L

burning were forced, in

simultaneously with section mounted on said retort v2. Anash remover for underfeed stokers consisting of a circular perforated grate surface including means for feeding coal upwardly through the center thereof, an ash pit under said grate surface, said grate surface having a plurality of ash discharge openings formed therein, ducts communicating with said ash discharge openings and 'said ash pit, an ash removing ring surrounding said circular perforated grate surface, a plurality of radial arms projecting inwardly from said ash ring and disposed above said perforated grate surface and means for imparting a relative oscillating motion between said ash removing ring and grate section whereby said arms will cover said discharge openings in one position and leave same uncovered in another .position.

3. An underfeed stoker having in combination a retort having an enclosing wall spaced therefrom to form a plenum chamber, an ash pit formed around said wall, an outer tuyre ring mounted on said wall and having a circular outermost portion, sectional tuyre elements disposed inside of said outer tuyere ring, the innermost portion of said tuyere elements forming an extension ofsaid retort and having air outlet openings formed therein, the upper portion of said tuyere elements being substantially horizontal and perforated for the purpose of permitting air to flow from said plenum chamber upwardly to fuel resting upon said perforated surface, a circular ash removing ring surrounding said outside tuyere ring, said ash removing ring having inwardly extending arms within the upper edge thereof disposed above said perforated surface, and means for imparting an oscillating movement to said ash removing ring, ash delivery ducts formed in the horizontal portion of said tuyere elements chamber.

EDWARD C. LUNDA. 

